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[Qemu-devel] Re: [PATCH +stable] block: don't attempt to merge overlappi
[Qemu-devel] Re: [PATCH +stable] block: don't attempt to merge overlapping requests
Wed, 19 May 2010 11:09:07 +0300
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On 05/18/2010 10:22 PM, Stefan Hajnoczi wrote:
On Tue, May 18, 2010 at 6:18 PM, Avi Kivity<address@hidden> wrote:
The block multiwrite code pretends to be able to merge overlapping requests,
but doesn't do so in fact. This leads to I/O errors (for example on mkfs
of a large virtio disk).
Are overlapping write requests correct guest behavior? I thought the
ordering semantics require a flush between overlapping writes to
ensure A is written before B.
What cache= mode are you running?
Do not meddle in the internals of kernels, for they are subtle and quick to